From inside (document excerpt):

Honeywell TH8000 Series Programmable Thermostats. Free owner’s guide and user’s manual in PDF format.Features
• Large, Clear Display with Backlighting—current temperature, set temperature and time are easy-to-read and all are displayed on the home screen
• Menu Driven Programming—Guides you through the scheduling process, showing only necessary information and choices on each screen
• Ability to Select Multiple Days—allows you to easily customize the thermostat for your unique schedule
• Real-Time Clock—keeps time during power failure; automatically updates for daylight savings
• Armchair Programming—allows you to remove thermostat from wall to set the schedule
• Precise Temperature Control (+/- 1°F)—reliable, consistent comfort
• Multiple HOLD options—allows you to modify schedule indefinitely or for a specific time
• Change Reminders—reminds you to service or replace the air filter, humidifier pad, ultraviolet lamp or thermostat batteries
• Programmable Fan—increases air quality when combined with a whole-house air cleaner
• Outdoor Temperature Indication (Select Models)—shows current outdoor temperature on the display to help you plan outdoor activities

Frequently Asked Questions and Answers
Q: Some or all keys on the display do not work; why?
A: Thermostat screen is locked See Advanced Setting section to unlock keys on the screen
Q: Backlighting seems dim; is it designed to be dim?
A: In models that use batteries for power, install fresh AAA alkaline batteries
Q: Thermostat is asking for heating or cooling to come on (screen shows “Heat On” or “Cool On” in display) but there is no heating or cooling running
A: Call your local heating and/or cooling contractor to check your heating and/or cooling system
Q: Under the Fan on the screen, Auto and On or Auto and Circ are shown What does this mean?
A: The Fan is programmed for either On or Circulate See the Fan Schedule section for more information
Q: Why doesn’t the thermostat respond when I touch the keys?
A: Check to determine if the screen is in the Locked or Clean mode See Screen Locked or Cleaning Thermostat Screen sections